[Yu Yue education] basic reference materials of electrical and electronic technology of Nanjing Institute of information technology

education
- Technology of Electrical Engineering - Chapter materials, examination materials - Nanjing Institute of information technology 【】
【 To talk about 】 What I hope to learn from this course ？
【 Guess what? 】 Who will study with me ？
1、【 Multiple choice 】 Do you think , In this course , What are the main reasons for you to come to elective study ？（ choice 2 The most likely ）
A、 Experience the online learning of this course
B、 The course content is related to my field of study and work
C、 I think this course will be very interesting
D、 The school requires me to study this course
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2、【 Multiple choice 】 Do you think , In such courses , What channels do you mainly know about the corresponding courses ？（ choice 2 The most likely ）
A、 classmate 、 Colleagues or friends recommend
B、 School or teacher notice
C、 Microblogging 、 WeChat 、 Nutshell network and other network communication channels
D、 Netease cloud class or love course website browsing found
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3、【 Judgment questions 】 In engineering courses , There are many female students .
A、 correct
B、 error
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In class quiz of circuit and circuit model
1、【 Single topic selection 】 The composition of the circuit includes ：
A、 Power Supply 、 load
B、 Power Supply 、 In the middle 、 switch
C、 Power Supply 、 load 、 In the middle
D、 Power Supply 、 load 、 resistance
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2、【 Multiple choice 】 The following devices belong to the power supply ：
A、 dry battery
B、 Battery
C、 Alternator
D、 Signal source
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3、【 Multiple choice 】 The following equipment or devices belong to the load ：
A、 The light
B、 The refrigerator
C、 Washing machine
D、 No. five batteries
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4、【 Judgment questions 】 A circuit is the passage of current , It is a whole composed of some electrical equipment and components connected in a certain way .
A、 correct
B、 error
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5、【 Judgment questions 】 Flashlight and audio amplification circuit belong to circuit .
A、 correct
B、 error
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unit 1 Homework
unit 1 test
1、【 Single topic selection 】 The circuit is shown in the figure , In the figure UCD=___V.
A、1
B、2
C、3
D、4
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2、【 Single topic selection 】 The composition of the circuit includes ( ).
A、 Power Supply 、 load
B、 load 、 In the middle
C、 Power Supply 、 load 、 In the middle
D、 None of the above
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3、【 Single topic selection 】 The following description is correct ( ).
A、 Voltage when the circuit is open =0, Current when the circuit is short circuited =0
B、 Voltage when the circuit is short circuited =0, Current when the circuit is short circuited =0
C、 Voltage when the circuit is open =0, Current when the circuit is open =0
D、 Voltage when the circuit is short circuited =0, Current when the circuit is open =0
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4、【 Single topic selection 】 As shown in the figure, the circuit , Find the power of components ,=（ ）W.
A、12
B、36
C、48
D、-48
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5、【 Single topic selection 】 As shown in the figure a Point potential ：=___V.
A、3
B、4
C、5
D、6
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6、【 Single topic selection 】 The two independent power supply models in the circuit are ( ).
A、 Voltage source 、 Current source
B、 Controlled voltage source 、 Current source
C、 Voltage source 、 Controlled current source
D、 Controlled voltage source 、 Controlled current source
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7、【 Single topic selection 】 Controlled power supply , The English abbreviation of voltage control voltage source is （）.
A、VCCS
B、VCVS
C、CCCS
D、CCVS
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8、【 Single topic selection 】 Controlled power supply , The English abbreviation of current controlled voltage source is （）.
A、VCCS
B、VCVS
C、CCCS
D、CCVS
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9、【 Single topic selection 】 Controlled power supply , The English abbreviation of voltage controlled current source is （）.
A、VCCS
B、VCVS
C、CCCS
D、CCVS
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10、【 Single topic selection 】 Kirchhoff's law is divided into ( ).
A、 Kirchhoff's law of voltage 、 Kirchhoff potential law
B、 Kirchhoff's law of voltage 、 Kirchhoff's current law
C、 Kirchhoff potential law 、 Kirchhoff's current law
D、 None of the above
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11、【 Single topic selection 】 Set the rating to 100V、600W The electric heater of is connected to 50V On the power supply of , Its power is ( ).
A、600W
B、100W
C、150W
D、300W
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12、【 Single topic selection 】 In the circuit , It is known that UAB=3V, be UBA=（）V, explain （）（ fill A or B） The potential of point is high .
A、3,A
B、3,B
C、-3,A
D、-3,B
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13、【 Single topic selection 】 In home lighting circuits , voltage 220V, Rated power 40W The lights of , Rated current =( )A.
A、0.18
B、1.58
C、3.55
D、1.45
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14、【 Single topic selection 】 Set the rating to 100V、600W The electric heater of is connected to 50V On the power supply of , Its power is ( ).
A、600W
B、100W
C、150W
D、300W
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15、【 Single topic selection 】 The two independent power supply models in the circuit are ( ).
A、 Voltage source 、 Current source
B、 Controlled voltage source 、 Current source
C、 Voltage source 、 Controlled current source
D、 Controlled voltage source 、 Controlled current source
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16、【 Single topic selection 】 In the circuit , It is known that UAB=3V, be UBA=（）V, explain （）（ fill A or B） The potential of point is high .
A、3,A
B、3,B
C、-3,A
D、-3,B
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17、【 Single topic selection 】 Controlled power supply , The English abbreviation of current controlled current source is （）.
A、VCCS
B、VCVS
C、CCCS
D、CCVS
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18、【 Single topic selection 】 Kirchhoff's law is divided into ( ).
A、 Kirchhoff's law of voltage 、 Kirchhoff potential law
B、 Kirchhoff's law of voltage 、 Kirchhoff's current law
C、 Kirchhoff potential law 、 Kirchhoff's current law
D、 None of the above
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19、【 Single topic selection 】 Set the rating to 100V、600W The electric heater of is connected to 50V On the power supply of , Its power is ( ).
A、600W
B、100W
C、150W
D、300W
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20、【 Single topic selection 】 In the circuit , It is known that UAB=3V, be UBA=（）V, explain （）（ fill A or B） The potential of point is high .
A、3,A
B、3,B
C、-3,A
D、-3,B
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21、【 Multiple choice 】 The circuit is shown in the figure , In the figure U=___V,I=___A.
A、U=5V
B、U=3V
C、I=1A
D、I=2.25A
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22、【 Multiple choice 】 As shown in the figure a Point potential ：（1）=__V;(2)I=__A.
A、=7V
B、I=1A
C、=5V
D、I=2A
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23、【 Multiple choice 】 The circuit is shown in the figure , In the figure U=___V,I=___A.
A、U=5V
B、U=3V
C、I=1A
D、I=2.25A
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24、【 Completion 】 Set the rating to 100V、600W The electric heater of is connected to 90V On the power supply of , Its power is ___W.
A、
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25、【 Completion 】 The circuit is shown in the figure , In the figure U=___V.
A、
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26、【 Completion 】 The circuit is shown in the figure , In the figure U=___V.
A、
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27、【 Completion 】 The circuit is shown in the figure , In the figure I=___A.
A、
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28、【 Completion 】 As shown in the figure, the circuit , Find the power of components , resistance Power =（ ）W.
A、
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29、【 Completion 】 As shown in the figure, the circuit , Find the power of components ,=（）W.
A、
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30、【 Completion 】 Set the rating to 100V、600W The electric heater of is connected to 90V On the power supply of , Its power is ___W.
A、
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31、【 Completion 】 The circuit is shown in the figure , In the figure U=___V.
A、
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32、【 Completion 】 The circuit is shown in the figure , In the figure U=___V.
A、
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33、【 Completion 】 In home lighting circuits , voltage 220V, Rated power 220W The lights of , Rated current =___A.
A、
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unit 2 Homework
unit 2 test
1、【 Single topic selection 】 In sinusoidal AC circuit , Maximum current Im And valid values I The relationship is （）.
A、Im=0.707I
B、I=0.707Im
C、I=1.414Im
D、 Undetermined
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2、【 Single topic selection 】 In sinusoidal AC circuit , The effective value of voltage is 220V, Then the maximum voltage is （）V.
A、311
B、156
C、380
D、110
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3、【 Single topic selection 】 Known complex number 3-j4, Then its polar coordinate formula is （）.
A、5∠53°
B、5∠-53°
C、5∠127°
D、5∠-127°
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4、【 Single topic selection 】 Known complex number A=8+j6,B=6-j8, be A/B be equal to （）.
A、1
B、j
C、1∠-90°
D、1-j
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5、【 Single topic selection 】 Known sinusoidal flow , voltage u=311sin（314t+30）V, electric current i=14.1sin（314t+60）A, Then what is the phase difference between voltage and current ？
A、30°
B、60°
C、—60°
D、—30°
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6、【 Single topic selection 】 Known sinusoidal flow , voltage u=311sin（314t+60）V, Then the effective value of the traffic flow is （）V？
A、311
B、200
C、220
D、380
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7、【 Single topic selection 】 Known sinusoidal flow , voltage u=311sin（628t+65）V, Then the frequency of this traffic flow is （）Hz？
A、50
B、100
C、150
D、200
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8、【 Single topic selection 】 Known sinusoidal flow , voltage u=311sin（6280t-240）V, Then the initial phase of the traffic flow is （）？
A、—240°
B、240°
C、120°
D、—120°
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9、【 Single topic selection 】 Known sinusoidal flow , electric current i1=10sin（314t+30）A, electric current i2=14.1sin（314t+60）A, Then the same amount of two currents is （）？
A、 Maximum
B、 Valid values
C、 cycle
D、 Initial phase
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10、【 Single topic selection 】 Known complex number 3+j4, Then its polar coordinate formula is （）.
A、5∠53°
B、5∠-53°
C、5∠127°
D、5∠-127°
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11、【 Single topic selection 】 Known sinusoidal flow , voltage u=311sin（314t+30°;）V, electric current i=14.1sin（314t+60°;）A, Then what is the phase difference between current and voltage ？
A、30°
B、60°
C、—60°
D、—30°
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12、【 Single topic selection 】 Known sinusoidal flow , voltage u=311sin（6280t-120°;）V, Then the initial phase of the traffic flow is （）？
A、—240°
B、240°
C、120°
D、—120°
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13、【 Single topic selection 】 Known two terminal network in sinusoidal AC circuit , Port voltage u=141.4sin（314t+30）V And electricity i=70.7sin（314t-30）A, Then what is the equivalent impedance of the circuit ？
A、2Ω
B、20Ω
C、2∠30°Ω
D、2∠60°Ω
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14、【 Single topic selection 】 Known two terminal network in sinusoidal AC circuit , Port voltage u=14.14sin（314t+30）V And electricity i=7.07sin（314t-30）A, Then what is the apparent power of the circuit vA？
A、100
B、50
C、25
D、125
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15、【 Single topic selection 】 Known two terminal network in sinusoidal AC circuit , Port voltage u=14.14sin（314t+30）V And electricity i=7.07sin（314t-30）A, Then what is the active power of the circuit W？
A、100
B、50
C、43
D、25
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16、【 Multiple choice 】 The three elements of sine quantity include （）.
A、 amplitude
B、 Angular frequency
C、 Phase difference
D、 phase
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17、【 Multiple choice 】 In AC circuit , The correct description of resistive elements is （）.
A、 The resistance value does not change with frequency .
B、 The phase difference between the voltage and current of the element is 0°.
C、 The resistance value changes with frequency .
D、 The phase difference between the voltage and current of the element is 90°.
E、 The voltage and current of the element are in phase .
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18、【 Multiple choice 】 In AC circuit , The correct description of capacitive elements is （）.
A、 The magnitude of capacitive reactance does not change with frequency .
B、 The phase difference between the voltage and current of the element is 0°.
C、 The magnitude of capacitive reactance varies with frequency .
D、 The phase difference between the voltage and current of the element is 90°.
E、 The phase difference between current and voltage of the element is 90°.
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19、【 Multiple choice 】 In AC circuit , The correct description of inductive elements is （）.
A、 The magnitude of inductive reactance does not change with frequency .
B、 The phase difference between the voltage and current of the element is 0°.
C、 The magnitude of inductive reactance varies with frequency .
D、 The phase difference between the voltage and current of the element is 90°.
E、 The phase difference between current and voltage of the element is 90°.
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20、【 Multiple choice 】 In AC circuit ,RLC In a series circuit , If the circuit is resistive , The following description is correct （）.
A、 Changing the frequency does not change the nature of the circuit .
B、 Increase frequency , The circuit is inductive .
C、 Reduce the frequency , The circuit is capacitive .
D、 Increase frequency , The circuit is capacitive .
E、 Reduce the frequency , The circuit is inductive .
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21、【 Multiple choice 】 The calculation of power in sinusoidal AC circuit includes （）.
A、 Instantaneous power
B、 Active power
C、 Reactive power
D、 Apparent power
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22、【 Judgment questions 】 In a sinusoidal AC circuit , The magnitude and direction of current and voltage change sinusoidally with time .
A、 correct
B、 error
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23、【 Judgment questions 】 In AC circuit analysis , The actual direction of the sine always changes with time , Therefore, it is meaningless to choose the reference direction .
A、 correct
B、 error
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24、【 Judgment questions 】 The maximum value of sinusoidal quantity is also called amplitude and amplitude value
A、 correct
B、 error
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25、【 Judgment questions 】 In AC circuits , The concepts of angular frequency and frequency are exactly the same , Describe how fast the sinusoidal quantity changes .
A、 correct
B、 error
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26、【 Judgment questions 】 In sinusoidal AC circuit , The amplitude is equal to the effective value .
A、 correct
B、 error
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27、【 Judgment questions 】 The current and voltage marked on the nameplate of AC electrical equipment are effective values .
A、 correct
B、 error
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28、【 Judgment questions 】 In choosing the withstand voltage of electrical appliances , The maximum value of voltage must be considered , Such as withstand voltage 220V The capacitor of cannot be connected to the voltage, and the effective value is 220V In the AC circuit of .
A、 correct
B、 error
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29、【 Judgment questions 】 The time required for the sinusoidal quantity to change for one week is called the period , Use symbols T Express , The unit is in seconds （s）
A、 correct
B、 error
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30、【 Judgment questions 】 Sinusoidal quantity in unit time （1s） Change the number of cycles , It is called angular frequency , A signed f Express , Unit Hertz .
A、 correct
B、 error
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31、【 Judgment questions 】 Phase is the physical state of sinusoidal quantity in a moment , Not only determine the magnitude of the instantaneous value of sinusoidal quantity and the positive and negative angle , It can also show the change trend of sinusoidal quantity .
A、 correct
B、 error
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32、【 Judgment questions 】 The phase difference between two sinusoidal quantities of the same frequency , It is called phase difference , And does not change with time , The phase difference of sinusoidal quantities with different frequencies changes with time .
A、 correct
B、 error
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33、【 Judgment questions 】 The phasor is a sinusoidal alternating current expressed in a complex number , Therefore, the complex number and phasor are equal .
A、 correct
B、 error
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34、【 Judgment questions 】 Kirchhoff's law is not applicable to the analysis of AC circuits .
A、 correct
B、 error
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35、【 Judgment questions 】 Resistance element in AC circuit , The magnitude of its impedance mode is the resistance value , Impedance angle 0, Expressed as R0
A、 correct
B、 error
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36、【 Judgment questions 】 The application of inductive elements in AC circuits , The magnitude of its impedance mode is the inductance value , Impedance angle 90, Expressed as L90
A、 correct
B、 error
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37、【 Judgment questions 】 The application of capacitive elements in AC circuits , The magnitude of its impedance mode is the capacitance value , Impedance angle -90, Expressed as C-90
A、 correct
B、 error
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38、【 Judgment questions 】 In AC circuits , The impedance mode size of the resistance does not change with frequency , But the impedance modes of capacitance and inductance change with the change of frequency .
A、 correct
B、 error
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39、【 Judgment questions 】 In AC circuits , Frequency changes will affect the nature of the circuit , Possible capacitive circuit to inductive circuit , Inductive circuit, variable capacitance circuit .
A、 correct
B、 error
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40、【 Judgment questions 】 In DC circuits , The total voltage must be greater than the partial voltage of each component , In the AC circuit, the total voltage is also the largest , The partial pressure of each component is small .
A、 correct
B、 error
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41、【 Judgment questions 】 The active power in sinusoidal AC circuit is the average value of instantaneous power in a cycle , The active power of capacitive and inductive elements is equal to 0.
A、 correct
B、 error
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42、【 Judgment questions 】 Reactive power in sinusoidal AC circuit is the energy exchange between capacitance and inductance components and external circuit or power supply .
A、 correct
B、 error
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43、【 Judgment questions 】 Apparent power is used to characterize the capacity of AC equipment .
A、 correct
B、 error
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44、【 Judgment questions 】 In mathematics , For imaginary units i Express , In circuit , For current i difference , use j To express .
A、 correct
B、 error
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45、【 Judgment questions 】 The reciprocal units of resistance and impedance are Siemens （S）
A、 correct
B、 error
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46、【 Completion 】 In sinusoidal AC circuit , Unless otherwise specified, it is generally a valid value , Such as , China's standard civil voltage （）V.
A、
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47、【 Completion 】 In sinusoidal AC circuit , If the frequency is 50Hz, Then the period is （）s.
A、
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48、【 Completion 】 If the phase difference of two sinusoidal quantities with the same frequency is 0, Then these two sinusoidal quantities with the same frequency are called （） .
A、
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49、【 Completion 】 If the phase difference of two sinusoidal quantities with the same frequency is 90°, Then these two sinusoidal quantities with the same frequency are called （） .
A、
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50、【 Completion 】 If the phase difference of two sinusoidal quantities with the same frequency is ±π;, Then these two sinusoidal quantities with the same frequency are called （） .
A、
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51、【 Completion 】 The reciprocal of impedance is called （） .
A、
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52、【 Completion 】 In sinusoidal AC circuit , If the frequency is 100Hz, Then the period is （）s.
A、
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53、【 Completion 】 In sinusoidal AC circuit , Unless otherwise specified, it is generally a valid value , Such as , Industrial voltage in China （）V.
A、
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